The planned marriage between Premierpiet and Probleempiet is in jeopardy, scholars Hans and Frans Steenstra have been kidnapped, and a rare ruby has been stolen from the Rijksmuseum. The dangerous Dr. Brein is behind all of this. Sinterklaas must intervene and even sends his Pieten on a trip to Switzerland to prevent Dr. Brein's criminal organization from gaining power.
| Actor | Role |
|---|---|
 Jos BrinkMuseum Directeur | Museum Directeur |
| RRicardo de GrootDonnie Bianco | Donnie Bianco |
| RRichard de RuijterBoris | Boris |
 Bart EttekovenSluwe Ruudje | Sluwe Ruudje |
| SSander FaasHans Steenstra | Hans Steenstra |
 Hetty HeytingTante Til | Tante Til |
| LLiane HoudijkPittige Pia | Pittige Pia |
| PPatrick KerklaanPatserpiet 1 | Patserpiet 1 |
 Hans KlokBisschop van Zwitserland | Bisschop van Zwitserland |
| KKenneth MacCayPrincipe Piet | Principe Piet |
| IIngeborg MastProbleempiet | Probleempiet |
 Bea MeulmanMarja, Assistent museumdirecteur | Marja, Assistent museumdirecteur |
 Martijn van NellestijnJoris | Joris |
| PPascal PichelVerkoper | Verkoper |
| SSebastiaan RebelPadvinderpiet | Padvinderpiet |
 Pamela TevesDr. Brein | Dr. Brein |
| SSandra ReemerAmbtenaar Burgerlijke Stand | Ambtenaar Burgerlijke Stand |
| EErik-Jan SlotAgent de Bok | Agent de Bok |